JP2004312214A - Lecturer side apparatus and trainee side apparatus in infrared ray video image transmission system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an infrared ray video image transmission system suitable for lectures or the like which cordlessly transmits audio and video signals to many monitor display apparatuses through infrared ray communication thereby being capable of distributing video and audio. <P>SOLUTION: The infrared ray video image transmission system comprises a lecturer side apparatus provided with: a radiator 25 that receives an audio signal and a video signal outputted from a lecturer side and transmits a multiplexed infrared ray corresponding to the signals; a microphone reception demodulator 36 that receives an infrared ray transmitted from a trainee side to obtain a microphone reply signal; and a questionnaire collection apparatus 31 that collects questionnaire signals, and comprises a trainee side apparatus provided with: a light receiving unit 42 for receiving an infrared ray; the monitor display apparatus 64 for displaying an image from the received infrared ray; a receiver 65 for reproducing an audio signal from the received infrared ray; and a light emitting unit 41 for transmitting the multiplexed infrared ray corresponding to an output signal from a microphone 52 picking up voice of a trainee and an output signal from a ten-key 53 operated by the trainee. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a speaker-side device and a student-side device of an infrared video transmission system that transmits audio and video signals to a receiver of a listener at a venue such as a lecture.
[0002]
[Prior art]
2. Description of the Related Art With the advancement of functions of video devices and the like, lectures using presentation devices such as personal computers and video projectors have become common in lectures and the like. In educational institutions such as schools, AV devices such as a television monitor and a personal computer are arranged in a classroom, and distribution of teaching materials using a network is performed (see Patent Document 1).
[0003]
[Patent Document 1]
JP 2003-69930 A
[Problems to be solved by the invention]
By the way, the conventional techniques as described above have the following problems to be solved.
Lectures using video projectors at lectures etc. can be achieved by concentrating the equipment on the podium, which makes it functional and relatively inexpensive, but inside the venue, it is difficult to hear the sound depending on the location, or the video projector However, there is a problem that the image on the screen projected by the camera becomes difficult to see. Everyone experiences that if they darken the room and make the screen easier to read, there is not enough light to read the material at hand. On the other hand, it is conceivable to arrange a large number of displays in front of and at as close to each of the audience members as possible, but there is a problem in that the cost is increased due to the large amount of wiring.
The present invention has been made by paying attention to the above points, and is capable of transmitting audio and video signals to a large number of monitor displays in a cordless manner by infrared communication and distributing video and audio. It is an object of the present invention to provide a speaker device and a student device of an infrared video transmission system.
[0005]
[Means for Solving the Problems]
The present invention solves the above problem by the following configuration.
<Configuration 1>
A radiator that accepts audio signals output from the speaker's microphone and image signals output from the presentation device and transmits multiplexed infrared light corresponding to these signals, A speaker-side device for an infrared video transmission system, comprising: a microphone reception demodulator that receives a transmitted infrared light to obtain a microphone response signal; and a questionnaire collection device that collects a questionnaire signal.
[0006]
<Configuration 2>
A receiver for receiving infrared light, a monitor display for displaying an image based on an image signal extracted from the received infrared light, a receiver for reproducing an audio signal extracted from the received infrared light, and a sound for a listener. A light emitting device that receives an output signal of a microphone and an output signal of a numeric keypad operated by a listener and emits multiplexed infrared light corresponding to the output signal. Student device of the video transmission system.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described using specific examples.
FIG. 1 is a block diagram showing a specific example of the infrared video transmission system.
Here, an example will be described in which the present system is used for presentation at a conference presentation. In the system shown in FIG. 1, a presenter (speaker) displays an image for presentation on a personal computer 21 and displays the image on a monitor display in front of each listener's desk. The radiator controller 10 and the radiator 25 are for transmitting a video signal to a monitor display in a cordless manner.
[0008]
On the input side of the radiator controller 10, a microphone 11, a microphone amplifier 12, an interpreter 13 and an AV selector 16 are connected. The microphone 11 accepts the speaker's voice. The microphone amplifier 12 amplifies the output signal of the microphone 11 and inputs the amplified signal to the radiator controller 10. The interpreter 13 is connected to a microphone (not shown) used by a simultaneous interpreter. AV devices such as a video camera 17, a DVD 18, a VTR 19, and an RGB converter 20 are connected to the AV selector 16. The AV selector 16 has a function of selecting one of AV devices such as a video camera 17, a DVD 18, and a VTR 19 connected to an input side, and inputting an output signal of the AV device to the radiator controller 10.
[0009]
Video cameras are used by lecturers to shoot and introduce arbitrary materials. The RGB converter 20 is a signal converter for converting an RGB signal output from the personal computer 21 into, for example, an NTSC color television signal and sending the signal to the radiator controller 10. The projector 22 is a device for displaying an image projected on a display of the personal computer 21 on a screen (not shown).
[0010]
When a speaker's voice, an image displayed on the personal computer 21, or a signal output from another AV device is input to the radiator controller 10, the signal is multiplexed, converted to an infrared signal by the radiator 25, and listened. Sent to the party. The radiator controller 10 FM-modulates each input signal to drive a light emitting diode for infrared transmission. In this system, it is practically preferable to design so that frequency multiplexing of about 6 to 8 channels can be performed. The receiving side may receive and demodulate the audio signal output from the microphone or any of the interpreting sound sources and the video signal selected by the AV selector. This system can not only send information unilaterally from a speaker to a listener, but also return voices and data from the listener to the speaker. The audio signal transmitted from the listener is received by the microphone receiver 35. The questionnaire data transmitted from the listener is received by the questionnaire receiver 30.
[0011]
The output signals of the questionnaire receiver 30 are totaled by the questionnaire collection device 31, and the result is displayed on the personal computer 21. For example, when an answer of "yes" or "no" is received by the questionnaire receiver 30 in response to the questionnaire question, the result of counting the number of "yes" and the number of "no" is a personal computer. 21 is displayed on the display. The questionnaire collection device 31 has a function of storing output signals of a large number of questionnaire receivers 30 in an internal memory and transferring the output signals to the personal computer 21 as required. The analysis of the questionnaire results is executed by a computer program installed in the personal computer 21. The output signal of the microphone receiver 35 is input to the microphone reception demodulator 36. The demodulated microphone response signal drives a speaker 37 located near the speaker. In order to transmit the microphone response signal to other listeners, the output signal of the microphone receiving and demodulating device 36 is input to the radiator controller 10 and transmitted through the radiator 25.
[0012]
FIG. 2 is a specific circuit block diagram of the system shown in FIG.
In this figure, the same parts as those shown in FIG. 1 are denoted by the same reference numerals. In FIG. 2, an OHP (overhead projector) 7 and a slide 8 are for performing a presentation by a well-known conventional method. When the OHP 7 or the slide 8 is used, only the speaker's voice is transmitted from the radiator controller 10 through the infrared radiator 25. The projector 22 is used to display an image showing the content of the lecture on the screen 3 provided near the speaker. The RGB signals output from the presenter PC (personal computer) 21 are sent to the radiator controller 10 via the RGB converter 20 and the AV selector 16. This is displayed on a display or the like provided on the desk of the listener through the infrared radiator 25.
[0013]
FIG. 3 is an explanatory diagram showing a specific configuration of the receiver at hand of the listener.
A stand in which the infrared transceiver 40 and the batteries 43, 44, and 45 are integrated as shown in FIG. 3 is arranged on the desk of the listener. The standard battery 43 is provided as standard. The necessary number of additional batteries 44 and 45 are added according to the power consumption, and are stacked below the infrared transceiver 40. Each of the stands is placed on a desk located between several listeners, and is battery-powered, cordless and requires no wiring. To each stand, two to three sets of numeric keys 53 to which a receiver 65 such as a monitor display 64, a microphone 52, and a headphone are attached are connected. These connections use cables. The monitor display 64 restores and displays the video signal received by the infrared transceiver 40. The receiver 65 restores and outputs the audio signal received by the infrared transceiver 40.
[0014]
The numeric keypad 53 is a keyboard for a listener to input a numerical value and transmit when a request such as a questionnaire is made. The microphone 52 is used by the listener to transmit his / her opinion to the speaker. If several sets of the monitor display 64 and the numeric keypad 53 are connected to one stand, complicated wiring is not required for the entire lecture hall. In addition, the system can be appropriately increased or decreased according to the number of audience members and the like, and there is an effect that a system can be easily constructed even in a lecture hall where no AV equipment is provided.
[0015]
FIG. 4 is a specific circuit block diagram of the receiver at hand of the listener.
The infrared transceiver 40 includes a light emitter 41 and a light receiver 42. The light emitter 41 is provided with a required number of LEDs (light emitting diodes) for emitting multiplexed infrared rays. These light emitting diodes are driven by the transmission device 51. The light receiver 42 is a light receiving element capable of extracting an output signal according to the intensity of the infrared ray when receiving the infrared ray. The output signal is sent to the receiving device 61. The transmission unit 50 is configured to send the output of the microphone 52 or the numeric keypad 53 to the transmission device 51. The transmitting device 51 receives the audio signal, performs FM modulation, and drives the light emitting element. The transmitting device 51 decodes the signal input from the numeric keypad 53, performs FM modulation, and drives the light emitting device 41. Thus, the voice of the attendee and the result of the questionnaire are transmitted to the speaker.
[0016]
Further, for example, a speaker's voice or a presentation image is received by the light receiver 42 via the radiator 25 from the radiator controller 10 shown on the right side of FIG. For example, eight LEDs are used for multiplexing for eight channels. Of course, it is more preferable to use a plurality of LEDs for each channel so that the irradiation light is emitted in a wide angle and in multiple directions. The received signal is input to the video circuit 62 and the audio circuit 63 via the receiving device 61. The output of the video circuit 62 drives the monitor display 64.
[0017]
As a result, an arbitrary image is displayed on the monitor display 64. The output signal of the audio circuit 63 is input to the receiver 65 and reaches the listener's ear. From the receiving device 61, for example, signals for eight channels are output. For example, the first channel is a signal for a monitor display, and the second channel is a signal for a receiver. In the lecture, when signals translated into various foreign languages such as Japanese, English, and French are transmitted, the listener may select a desired channel and connect a receiver to the output signal.
[0018]
As shown on the right side of FIG. 4, the radiator 25 incorporates a light emitter 29 similar to that used in the infrared transceiver 40. The microphone audio signal and the input signal of the numeric keypad transmitted from the infrared transceiver 40 on the listener side are received by the light receivers 38 and 39 provided in the infrared transceiver 40, respectively. Is transmitted to the device 30 and the microphone receiver 35. Each transmitter, receiver, and the like can have a cordless power supply line by, for example, reducing the size of a fuel cell and incorporating it.
[0019]
In the system described above, a transmitting device that multiplexes an audio signal or an image signal and drives and transmits an infrared light emitting device, and a large number of receiving devices that receive and reproduce the infrared signal transmitted from the infrared light emitting device, provide one system. An N-to-N video transmission system is obtained. Moreover, by including a configuration that can return a simple response, a multifaceted lecture can be provided. For example, if a microphone or numeric keypad is provided with an identification code such as an IP address in the same manner as a network device connected to an infrared LAN, the speaker can receive the response from the listener separately. it can. In addition, communication using infrared light is difficult to be eavesdropped outside the room, and does not generate external interference radio waves. On the other hand, the radiator may be hung from the ceiling, or the infrared transmitter / receiver on the listener side may be placed on a desk, since the part with poor visibility may be shaded.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a specific example of an infrared video transmission system.
FIG. 2 is a specific circuit block diagram of the system shown in FIG. 1;
FIG. 3 is an explanatory diagram showing a specific configuration of a receiver at hand of a listener.
FIG. 4 is a specific circuit block diagram of a receiver at hand of a listener.
[Explanation of symbols]
Reference Signs List 10 radiator controller 11 microphone 12 microphone amplifier 13 interpreter sound source 16 AV selector 17 video camera 18 DVD
19 VTR
Reference Signs List 20 RGB converter 21 Personal computer 22 Projector 25 Radiator 30 Questionnaire receiver 31 Questionnaire collection device 35 Microphone receiver 36 Microphone reception / demodulation device 37 Speaker 40 Infrared transceiver 41 Light emitter 42 Light receiver 43 Standard batteries 44, 45 Additional battery 52 Microphone 53 Numeric keys 64 Monitor display 65 Receiver

Claims (2)

A radiator that accepts an audio signal output from a speaker's microphone and an image signal output from a presentation device, and emits multiplexed infrared light corresponding to these signals;
A microphone receiving and demodulating device that receives infrared light transmitted from the listener side and obtains a microphone response signal;
A speaker-side device for an infrared video transmission system, comprising: a questionnaire collecting device for collecting a questionnaire signal. A receiver for receiving infrared light,
A monitor display for displaying an image based on an image signal extracted from the received infrared light,
A receiver for reproducing an audio signal extracted from the received infrared light,
A light emitting device that receives an output signal of a microphone to which a voice of a listener is input and an output signal of a numeric keypad operated by the listener, and emits multiplexed infrared light corresponding to the output signal; A student-side device for an infrared video transmission system, characterized in that:

Images